Underground and submarine antenna



E. C. HANSON.-

UNDERGROUND AND SUBMARINE ANTENNA. APPLICATION mm FEB.25, 1919.

Patented'Aug. 23, 1921.

IIIIIIkIIIIIIII/IIIIIIIbIIIIIIIIIIIIIIII WITNESS: INVENTOR. l

several viws arrangement of ground and sorted at intervals through -i Specification of Letters Patent.

1,388,336; I 23,1921 Application and Ji'ebruary as, me. Serial x. 270,070, To whom at my concern rine antenna made up of a series of concenes citizen of the United States, residing at roughout the length of the antenna conas ington, in the istrict of Columbia, uctor In this case the antenna is shownin ave invented celtain new and useful Imcon 'unction with'an earth plate onnected provements in Underground and Submarine with radio receivin apparatus by means of ntennae, of which the following is a speclead 4, in lieu of tEe opposite antenna con- 1 cation, re therein to uctor shown in F 1 ference being had 1 or submarine antennae are constructed in the form of spirals to sub the race tion of radio signals. tel

The o ject of this to provide an underground and submarine antenna which is not respo antenna of greater fore obtaina ms I A. c aracteristic of the antennae e hig Other and further ob ects Wlll become apdamped oscillations produced by strays wi 1 parent asthe specification progre e prevented from reachin the receivin a paratus due to the retar 'ng'eflect o the have been ig inductance of the antenna 'In Figs. to designate like parts throughout the 2 and 3 the same rinciple exists. a The rapidly damped osci lations due to strays. are retarded, while persistent oscillations of con-' tinuous waves are unobs In Fi 2 the inductances are lumped instead 015 being distributed in the antennae, and each inductance shunted by a condenser. The condensers are adjusted to such capacity in conjunction'with predetermined inductances thatindividual tuned oscillato circuits are formed throughout the length of the antennae which make it possible for sustained oscillations to pass, but which act as retarding means to strays. 'Fig. 3: shows a series of, lumped indu'cn tances in one underground or sub antenna which can be used with underground system as shown at 6. a 10o aving thus described my invention, 'whatI claim is; 1 he antennae are formed of spiral induc- 1.," A wir le system electro-magnetic wavescomprising antennae view in section showing one an underground and .submarine antenna within a conduit in which t e antennae are formed in spirals;

hows a modified arrangement of Figure '1 is a condensers, out the length of the conductors Fig. 3 shows the condult inclosing an an? tenna having only lumped inductances ingth.

tro-magnetic formed; of call) free at m conduit, sai

Q g Y 1,388,336

apart throughout the length of the antennae tially parallel to and buried under the surand extending in opposite directions su face of the earth.

' stantially parallel to and buried under the 4. An underground antenna for radio sigsurface of the earth. 1 naling comprising a pair of extended in- 5 3. A wireless system for signaling by ductances connected to radio signaling apelectro-magnetic waves comprising antennae paratus and buried-horizontally in the earth,

. disposed inconduit and including a series said inductances having their axes alined in of lumped inductances with shunted capaciopposite directions'and their ends electrities electrically free at their outer extremically free.

10 ties extending in opposite directions substan- EARL C. HANSON. 

